Machine for casting metal under pressure



Sept. 21 1943. 5 SMITH ET AL 2,329,95

MACHINE FOR CASTING METAL UNDER PRESSURE Filed July 18, 1942 2 Sheets-Sheet l Sept. 21, 1943. s. SMITH ET AL MACHINE FOR CASTING METAL UNDER PRESSURE Filed July 18, 1942 2 Sheets-Sheet 2 llllrlllulllllll' Ill l lnvezaiors 5.3m 661: HH.Coc Z1e1z/LZ/ j fltiyg Patented Sept. 21, 1943 MACHINE FOR CASTING METAL UNDER PRESSURE Stanley Smith and Wilfred Henry Cockerill, West Bromwich, England, assignors to E. M. B. Company Limited, West Bromwich, England Application July 18, 1942, Serial No. 451,458 In Great Britain July 24, 1941 1 Claim.

This invention relates to a die casting machine of the kind in which a discharge duct (usually termed a gooseneck) for conveying molten metal from the melting pot to the die is mounted within the pot. The object of the invention is to provide an improved construction of melting pot and gooseneck.

The invention comprises the combination of a melting pot having a pair of intercommunicating compartments one of which is closed and adapted for the admission thereto of compressed air or other gas, a gooseneck situated in the second of the two compartments and having an inlet through which molten metal can flow into it from the pot, ,and a movabl member for opening and closing the said inlet, the gooseneck being also adapted for the admission thereto of compressed air or other gas, and the arrangement being such that molten metal can be caused to flow into the gooseneck under the action of compressed air or other gas admitted to one of the pot compartments and discharged by air or other ga admitted to the gooseneck.

In the accompanying sheets of explanatory drawings, Figure 1 is a part sectional elevation and Figure 2 a part sectional plan of apparatus constructed in accordance with the invention.

In carrying the invention into efiect as shown, we employ for melting the metal to be cast a cast iron or other pot a of any convenient shape and size which is divided into two compartments 1), c

by a transverse partition d, the two compartments being in communication with each other through holes e in the lower part of the partition. The

compartment b is closed by a cover piece 7, and any convenient means (such as a pipe connection 9 attached to the cover piece) may be provided for admitting compressed air or other gas to this compartment. The other compartment may be open to or in free communication with the atmosphere.

Within the compartment 0 is situated a gooseneck h which may be formed integrally with or fixed to the pot a, and which extends along the centre of this compartment. The inlet end of the gooseneck h is situated adjacent to the partition 01 and the other end terminates in a discharge orifice i in the end of the pot a remote from the partition, the discharge orifice being adapted to accommodate the usual nozzle 1 through which molten metal can be injected into a casting die. The inlet of the gooseneck h is formed by a cast iron or other suitable metal bush 7' situated in an orifice occupying a horizontal plane above the normal level of the molten metal in the pot a. This inlet 7 is shaped to form an annular seating with which can co-operate the lower end of a vertically movable closure plug it. Preferably the plug it is hollow and water cooled. The portion of the gooseneck h lying between the inlet 7' and the discharge orifice i is in the form of a chamber 111. the upper end of which extends beyond the upper portion of the pot a. The upper end of the chamber 111. is provided with a pipe connection n whereby compressed air or other gas can be admitted to the chamber. Any convenient provision is mad for heating the pot (1. Thus in the example shown the pot a is mounted in a heating chamber 0.

The mode of operation of the apparatus above described is as follows: When it is required to admit a charge of molten metal from the pot a to the gooseneck h, the plug it i raised clear of the gooseneck inlet 7, and compressed'air or other gas is admitted to the compartment 11 of the pot. The effect of the pressure exerted in the compartment b is to raise the level of the free surface of the metal in the other compartment 0 and thereby enable metal to flow into the gooseneck through the inlet 7'. After the required charge has been admitted the air or other gas pressure acting on the metal in the compartment 1) is released. Also the plug 7c is returned and caused to close the inlet 1' tightly. Compressed air or other gas is then admitted to the gooseneck It for expelling a charge of molten metal from the gooseneck through the nozzl Z in the discharge orifice i to the die.

By this invention we are able to provide a Combined pot and gooseneck which is of simple construction and durable in service.

The invention is not however limited to the example above described as subordinate details may be varied to suit requirements.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is:

For use in a die casting machine of the kind specified, apparatus comprising the combination of a melting pot having two compartments which intercommunicate in the vicinity of their lower ends and which are each adapted to contain molten metal, one of the compartments being closed, means whereby compressed air or other gas can be admitted to the closed compartment for displacing molten metal therefrom into the second compartment, a gooseneck situated in the second compartment and having an inlet at such a position above the normal level of the molten metal in the pot that molten metal from the second compartment can flow through the inlet into the gooseneck when the level of the molten metal in the second compartment is raised sulficiently by molten metal displaced from the closed compartment, a movable member for opening and closing the said inlet, and means whereby compressed air or other gas can be admitted to the gooseneck for discharging molten metal therefrom.

STANLEY SMITH.

WILFRED HENRY COCKERILL. 

